WM8351 datasheet(141/330 Pages) WOLFSON

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Production Data

WM8351

PD, April 2012, Rev 4.5

141

14.8.3

DC-DC STEP UP CONVERTER

DC-DC Converter 2 is a versatile step-up pulse-width-modulated (PWM) DC-DC converter designed

to deliver high power efficiency across full load conditions. The converter can also be used as a

switch.

DC-DC Converter 2 is designed with a fixed frequency current mode architecture. The clock

frequency is set by the internal RC oscillator, which provides a 1.0MHz clock.

The PVDD supply pin provides the core supply for DC-DC Converter 2.

The connections to DC-DC Converter 2 in Constant Voltage Mode are illustrated in Figure 70. See

Section 29.4 for details of the connections for the Constant Current and USB operating modes of the

DC-DC Step-Up Converter.

Figure 70 Step-Up DC-DC Converter Connections

The external components at the converter output are required by the DC-DC Converter integral loop

compensation circuit. Note that the recommended output capacitor Cout varies according to the

required output voltage.

See Section 29.4 for details of the recommended external components.

WM8351 bảng dữ liệu(PDF) 141 Page - Wolfson Microelectronics plc